Cast members Justin Bartha, left, Ari Graynor and Jesse Eisenberg arrive at the premiere of their Holy Rollers in New York on Monday.

The Hangover star wore a Haiti relief ribbon pin in the red, yellow and blue colors of the Haitian flag and said he's donated money and is encouraging his co-stars to sign up to donate more. He's also involved in a silent auction of items from the film to raise money. "Mostly I'm sending my prayers."